Methanol to Gasoline over La/HZSM-5 Catalyst Modified by Na₂CO₃

Abstract:

HZSM-5 catalysts with SiO₂/Al₂O₃ molar ratio of 80 were treated with 0.4 mol/L Na₂CO₃ solution at 80°C for 2 h to improve diffusion properties. Further, some of these catalysts were modified by impregnation of La (NO₃)₃. These catalysts characterized by XRD and BET were evaluated in a fixed bed reactor for conversion of methanol to gasoline (MTG) reaction. The Na₂CO₃ treatment results in formation of mesoporous structure in ZSM-5 zeolite. Meanwhile, LaZSM-5/AT catalyst exhibits significantly enhancement in catalytic lifetime and liquid hydrocarbons yield as well as selectivity of isoparaffin and olefin. The conversion of methanol remains above 80 % over 125 h on LaZSM-5/AT catalyst under atmospheric pressure, 380°C and weight hourly space velocities (WHSV) of 1.5 h^-1.

• Periodical: Advanced Materials Research (Volumes 953-954)
• Pages: 1215-1220
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.953-954.1215
• Online since: June 2014
• Authors: Xiao Feng Gao, Chuan Min Ding, Wei Li Liu, Jun Wen Wang*, Kan Zhang, Ping Liu
• Keywords: La Impregnation, Mesoporous, Methanol to Gasoline, ZSM-5 Zeolite

References

[1] Yinbin WANG, Jiazhong ZANG, Haibin Yu, Exporing the Progress of Methanol-to-gasoline Technology and Relates Issues , Coal Chemical Industry. 3 (2011) 16-19.

[2] Songwei HU, The Preliminary Feasibility Analysis of MTG, Petroleum & Petrochemical Today. 7 (2011) 13-16.

[3] Kati Barbera, Francesca Bonino, Silv Bordiga, et al, Structure–deactivation relationship for ZSM-5 catalysts governed by framework defects, Journal of Catalysis . 6 (2011) 196-205.

DOI: 10.1016/j.jcat.2011.03.016

[4] Cartilige S., Nissen H. U, Wessiccken R, Ternary mesoporous structure of ultrastable zeolite CSZ-1, Zeolite. 4 (1989) 346-349.

DOI: 10.1016/0144-2449(89)90083-3

[5] Groen J. C., Moulijn J. A, Perez-Pamirez J, Alkaline Posrtteratment of MFI zeolites. From Accelerated Screening to Scale-up, Industril & Engineering Chenistry Research. 46 (12) (2007)4193-4201.

DOI: 10.1021/ie061146v

[6] Suzuki T, Okuhara T, Change in pore structure of MFI zeolite by treatment with NaOHaqueous solution, Micropor. Mesopor. Mat. 43 (1) (2001) 83-89.

DOI: 10.1016/s1387-1811(00)00349-8

[7] Sami M.T. Almutairi, Brahim Mezari, Evgeny A. Pidko, et al, Influence of steaming on the acidity and the methanol conversion reaction of HZSM-5 zeolite, Journal of Catalysis. 11 (2013) 194-203.

DOI: 10.1016/j.jcat.2013.07.021

[8] Youming Nia, Aiming Suna, Xiaoling Wua, et al, J. Journal of Natural Gas Chemistry Vol. 20(3) (2011) 237.

[9] Yingping HE, Min LIU, Chengyi DAI, et al, Modification of nanocrystalline HZSM-5 zeolite with tetrapropylammonium hydroxide and its catalytic performance in methanol to gasoline reaction, Chinese Journal of Catalysis. 11 (2013) 1148-1158.

DOI: 10.1016/s1872-2067(12)60579-8

[10] H.A. Zaidi, K.K. Pant, Catalytic conversion of methanol to gasoline range hydrocarbons, Catalysis Today. 9 (2004) 155 -160.

DOI: 10.1016/j.cattod.2004.06.123

[11] Ruren Xu, WenQin Pang, et al. White, Chemistry-Zeolites and Porous Materials, Science press , Beijing, china, (2004).

[12] Bj0rgen M, Joensen F, Holm M S, et al, Methanol to gasoline over zeolite H-ZSM-5: Improved catalyst performance by treatment with NaOH, Applied Catalysis A: General. 345 (2008) 43-45.

DOI: 10.1016/j.apcata.2008.04.020

[13] Francesca L. Bleken, Ton V.W. Janssens, Stian Svelle, et al, Product yield in methanol conversion over ZSM-5 is predominantly independent of coke content, Microporous and Mesoporous Materials . 164 (2012) 190-198.

DOI: 10.1016/j.micromeso.2012.06.020